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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f50b5bd000c1213dbb8862c25594f0196a0e4981f26b1d516ec8b0386eb5ea' 
  AND token = 'TUrgFKbgH93hhQsoL3/504OO5RAwB8YgtluSXotrP68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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