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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed6eecbb4cf554dca3f7da4f948191c97b617f4136d906d65eff408e2e09e6f' 
  AND token = 'Ud01c8mv3UTUy7dFEVR6KXl2TwYod75nNkU3GTOvCQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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