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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50bc1eb631cd13ecc318528454c187bbb51d20e114ba50b1ce5e3d0e95d1d48' 
  AND token = 'wRAv1VwB6vC/RVnUwET1//TnUx56f4TRyDJiRgRYlbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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