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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959085a0b97c905e6c52183189538a4e702600a90afc73c738e8f8ffa84f8fb2' 
  AND token = 'tVFaEdLGMIW8t8kXUBDHvjtRXnz/mZjo9zvpiCpsTCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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