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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699687e169365f9b5459d7c06a7fda8a9e94e6471697f18ab30697648a3a1b75' 
  AND token = 'f0hKpFQm27goplF1D3/r8+AkIW7+fZ0etWB0TG/hkAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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