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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f5aab57ea24f3bf7a9760f804f9fc959e7fc66078eba0a2e83e0dbc6c72d06' 
  AND token = 'f4ZnT6YGKHwCTDjG5xd7EmRXHV66yg0cC5/18wxE210=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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