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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96440916d0eba2e5b11d281293bf2f7e43a71bddea38906e8364d8c138936bf2' 
  AND token = '0o67BXHHBNvjmi97q2ROR4i6S/RcH8nISfClJDQXK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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