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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcbf31af2f96326496db6f5a3a3ffc8f3fa1f5e52004a6cf0220f37af8cd974' 
  AND token = 'xQJr+qldvH2L06cqzsa0K4rOjqWebBywUF1PdVhuWo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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