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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd292142a86ab4b5331191ff7d9614cc0b04cafef3e2260f14f6be3f1f4ecd682' 
  AND token = 'WVSPgSsnGSOTOQ/+i6sxzOOXpEk1szQ+O/63DzRfroQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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