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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addb0874179fc6af5f56ea441e9c894e0d10425197c60f94419235d4e7d0fe1f' 
  AND token = '0zBW3AzsDZB4KcyyzIo8qlXXyzodHh/rx8EOWWOq1Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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