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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe0c66dda40adc164ea7f7b86bcf4f2f09cbbf813b45beee0507aa981955134' 
  AND token = 'Yo0NRm8UCb/rxQC1iERbk6bxG3u63B2ZC/bpj5spZVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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