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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ec2192a27fcfacc4562bc1d155bc37a21256520eec9f7cb69fc8f42b9da256' 
  AND token = '38h1Shq8AQuKWllPJOqB7vggRBkVnAu5KxRG8Wc74Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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