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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895754e839bddc36684c320c622c6da851879201dfe4a060e77b35580177ea71' 
  AND token = '5SKsVbeS+tSsLB91tx8ftqS45GgXA+6eOWShYz2B4TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}