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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1712aafc50187e7b112a337e410f8cf571b46c739f92b0ad303e020473eac74' 
  AND token = '00KXCvju83J8FDn+O2CSmqegoarUjFLNYzucyAf8ttQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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