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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f340a546e1d2ae50c24d010b280167f622250a03d5428603074ae4e00e28e0d' 
  AND token = 'm8xMKoLLkdB8uG3iTOAE/TdWVuMimFHfjVd6GTYGPns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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