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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee3f5b9ca9df8b0d1b42eb0abd441cb8a2c466a29c257296359fade82b4ec91' 
  AND token = 'lyj84KZhp4mVMzOvQKEqKkamDOu1qEGtAoY860N6Ky4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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